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It is a piece of electronic circuit control board, which is responsible for monitoring the protection of the battery pack in each section of the battery voltage to prevent overdischarge and overcharge, because the battery has a series and parallel, a group where the battery charge in series is The same, if the capacity of several batteries is not the same, when charging, when a section is full, the other is not full, if you recharge, then the full section of the overcharge, so just a simple measurement of the battery The total voltage to reflect the battery is full of the situation is not correct. It will cause the unbalanced battery to accelerate damage. So there is a need for a control panel to monitor each cell.